Taking a walk down memory lane, I thought back to the first weight set I ever had. I believe my parents got it for me when I was in middle school or high school. I am guessing around 1985. That is why I snagged the image above. It was a DP Magnum set with the butterfly pec attachments, leg extension and leg curl attachments. I also recall having a 110# cast iron weight set with a (2) 25# (4) 10# and (4) 5# plates plus a hollow bar and dumbbell handles. The hollow bar was quickly bent when I added additional weights which were concrete filled plastic.
Digging through my archives, I found that I had sold it out of my parent's house in January 2009 for $40. New I am guessing it cost between $200 and $250. I have absolutely no regrets selling everything for 20 cents on the dollars or 20 cents/pound despite current market conditions.
I never like the attachments, but it was a surprisingly stable adjustable bench. I recall the clips had square head set screws. The dumbbells were also quite effective and could be loaded to 30# each which was more than sufficient for me.